663128 has 8 divisors (see below), whose sum is σ = 1243380. Its totient is φ = 331560.

The previous prime is 663127. The next prime is 663149. The reversal of 663128 is 821366.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 663097 and 663106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41438 + ... + 41453.

2⁶⁶³¹²⁸ is an apocalyptic number.

It is an amenable number.

663128 is a deficient number, since it is larger than the sum of its proper divisors (580252).

663128 is a wasteful number, since it uses less digits than its factorization.

663128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82897 (or 82893 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 663128 is about 814.3267157597. The cubic root of 663128 is about 87.2032066829.

The spelling of 663128 in words is "six hundred sixty-three thousand, one hundred twenty-eight".